Context7
by upstash
Feeds AI the latest docs for libraries and frameworks before it answers, so code it writes does not use outdated, removed functions.
Computer or cloud★ 64,224MITUpdated yesterday
Install
Sunstone Weave: Local Semantic Code Search
Overview
Description from the maker (original English)
Semantic search over local folders of code and docs, with a code-search encoder running on your CPU.
PopNx MCP’s three pillars
These three are never merged into one score: opinions, measurements and popularity are different things.
- User voiceiNo reviews yetReviews open together with accounts in a later step
- Our basic checksi1 of 1 passedChecked from public information; code not scanned yet
- UsageiNot measured yet★ –
What you can do with it
We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.
- Connection: Runs on your computer
- Transport: stdio
- Category: Search & AI memory
Install
Pick the AI app you use, then copy the settings.
Before you install
- Basic checks: 1 of 1 passed
- Runs on your computer with your user’s permissions (files, network, apps).
- You fill in yourself:
BLACKWINDOW_WEAVE_CACHE
You need
- npmNode.js installed (for the npx command)
Which app do you use?
Pick your app above. We remember it, so next time the button says “Install in …”.
Open Claude Desktop → Settings → Developer → Edit Config, and paste this into claude_desktop_config.json
{
"mcpServers": {
"blackwindow-weave": {
"command": "npx",
"args": [
"-y",
"blackwindow-weave-mcp"
],
"env": {
"BLACKWINDOW_WEAVE_CACHE": "your-value"
}
}
}
}Run this in your terminal
claude mcp add blackwindow-weave --env BLACKWINDOW_WEAVE_CACHE=your-value -- npx -y blackwindow-weave-mcpFill in the empty values before running it.
Or copy the settings yourself
Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json
{
"mcpServers": {
"blackwindow-weave": {
"command": "npx",
"args": [
"-y",
"blackwindow-weave-mcp"
],
"env": {
"BLACKWINDOW_WEAVE_CACHE": "your-value"
}
}
}
}Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.
Or copy the settings yourself
Paste into .vscode/mcp.json in your project
{
"servers": {
"blackwindow-weave": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"blackwindow-weave-mcp"
],
"env": {
"BLACKWINDOW_WEAVE_CACHE": "your-value"
}
}
}
}Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.
This one runs on your computer, and ChatGPT can only connect to servers on the internet. Pick another app.
Your choice stays on this device in a cookie; no account needed.
Values you fill in
BLACKWINDOW_WEAVE_CACHEenvWhere the encoder and the indexes are kept (default ~/.cache/blackwindow-weave, %USERPROFILE%\.cache\blackwindow-weave on Windows)
These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.
What it can do
Runs on your computer; the tool list appears in your AI app after you install it.
Basic checksi
We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 8, 2026
- ✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account space-bacon, which owns the repo
- … Not checked yet
Still maintained
We have not read this repo from GitHub yet
- … Not checked yet
Has a licence
We have not read this repo from GitHub yet
- – Not applicable
Endpoint responds
This one runs on your computer; there is no internet endpoint
- – Not applicable
Sign-in with OAuth
Runs on your computer and uses local settings instead
- … Not checked yet
No hidden instructions in tool descriptions
Runs on your computer; we can only read tool lists from internet endpoints
Compared with others in Search & AI memoryi
- More stars than 0% of the other 5671 servers in this category
- Published to the registry more recently than 52% of the other 5671 servers in this category
- Basic checks equal to or better than 100% of the other 5671 servers in this category
Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.
Common questions
Is Sunstone Weave: Local Semantic Code Search safe?
It passed 1 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.
What keys or codes does it need?
The registry does not list a required key, though some servers ask you to sign in on first use.
Does it run on my computer or in the cloud?
It runs on your computer. Your AI app starts it when needed, and data does not pass through the maker’s servers (unless it calls an online service itself).
Is it still maintained?
The GitHub repo last changed –, and the latest version (0.1.2) reached the registry 38 days ago.
Which apps can use it?
Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need Node.js on your computer.
What can I use instead?
In the same category: Context7, Codebase Memory, Exa
Alternatives
Servers in the same category from other makers, sorted by stars.
Reading a card:★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi
Codebase Memory
by DeusData
Codebase knowledge graph for AI agents — 162 languages, sub-ms queries, 99% fewer tokens.
Runs on your computer★ 48,148MITUpdated 21 days ago
Install
Exa
by exa-labs
Connect AI agents to Exa for web search, content fetching, and multi-step research.
Runs in the cloud★ 5,213MITUpdated 2 months ago
Install
README from the maker
Open the README
Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.
blackwindow-weave-mcp
Semantic search over the folders on your machine, for any MCP client. The server cuts source code and documentation into passages, embeds them with Motherlode, a 33M-parameter code-search encoder, on your CPU, and answers questions such as "where is a pairing line parsed into url, key and name" with file paths, line ranges and the passages themselves.
The only network requests are to huggingface.co on the first run: six requests, which leave five files, 133,752,819 bytes, in the cache. With the files cached, a run makes none.
This is the weave from Black Window and the Sunstone VS Code extension, packaged for clients that speak the Model Context Protocol. It runs on macOS, Linux and Windows with Node 20 or later.
Install
Install it once from a terminal, before adding it to a client. This installs the package and ONNX Runtime and prints the version once the runtime has loaded:
npx -y blackwindow-weave-mcp@0.1.2 --versionOn GitHub's hosted runners, from an empty npm cache, this first install took 7 to 13 s on Linux and macOS and 55 to 69 s on Windows. Clients wait a limited time for a server to start (the MCP SDK's default is 60 s), and a client that stops waiting in the middle of an install can leave a broken copy in npm's cache (see Troubleshooting). Once installed, the server starts in under 3 s.
Keep the version in the client's configuration the same as here. With a version given, npx starts the copy it installed; with the bare name, npx (npm 11) looks for a newer version on every start and installs it while the client waits.
On Linux x64, ONNX Runtime also downloads 236 MB of CUDA libraries during the install. This server runs on the CPU and never loads them, so you can skip them:
ONNXRUNTIME_NODE_INSTALL=skip npx -y blackwindow-weave-mcp@0.1.2 --versionAdd it to a client
macOS and Linux
Claude Code:
claude mcp add weave -- npx -y blackwindow-weave-mcp@0.1.2 --folder /path/to/your/repoVS Code, in .vscode/mcp.json:
{"servers": { "weave": { "type": "stdio", "command": "npx", "args": ["-y", "blackwindow-weave-mcp@0.1.2", "--folder", "${workspaceFolder}"] } } }
Cursor, Claude Desktop, Windsurf and most other clients:
{"mcpServers": { "weave": { "command": "npx", "args": ["-y", "blackwindow-weave-mcp@0.1.2", "--folder", "/path/to/your/repo"] } } }
Windows
On Windows npx is a batch file, which a client can only start through cmd /c. Claude Code:
claude mcp add weave -- cmd /c npx -y blackwindow-weave-mcp@0.1.2 --folder C:\path\to\your\repoCursor, Claude Desktop, Windsurf and most other clients:
{"mcpServers": { "weave": { "command": "cmd", "args": ["/c", "npx", "-y", "blackwindow-weave-mcp@0.1.2", "--folder", "C:/path/to/your/repo"] } } }
In VS Code the same command and args go under servers in .vscode/mcp.json, with "type": "stdio".
Installed globally
npm install -g blackwindow-weave-mcp@0.1.2 installs a blackwindow-weave-mcp command, which a client can start directly (cmd /c blackwindow-weave-mcp on Windows). To run from this repository instead of npm, replace blackwindow-weave-mcp@0.1.2 in the arguments with github:space-bacon/blackwindow-weave-mcp.
| option | meaning |
|---|---|
--folder | Weave this folder when the server starts. Repeatable. Optional: the model can call weave_folder itself. |
--cache | Where the encoder and the indexes live. Default ~/.cache/blackwindow-weave (on Windows %USERPROFILE%\.cache\blackwindow-weave), or BLACKWINDOW_WEAVE_CACHE. |
--version | Print the version and exit. |
Platforms
Every push runs CI on Linux (x64 and arm64), Windows (x64) and macOS (Apple silicon), each with Node 20, 22 and 24. Each job runs the stdio smoke test below from a checkout. It then installs the packed package through npx from an empty npm cache, starts it the way a client does and weaves a folder. On Windows it also starts it through cmd /c. Last, it installs the package globally and starts it by its command. Other platforms, such as Windows on Arm, Intel Macs and Alpine Linux, are not tested.
Troubleshooting
The client times out when it first starts the server, or the server stops with `Cannot find module ... transformers.node.mjs`. A first install was interrupted, usually by a client that stopped waiting, and npm kept the half-installed copy. Delete npm's npx cache and install again from a terminal with the line under Install:
- macOS and Linux:
rm -rf ~/.npm/_npx - Windows (PowerShell):
Remove-Item -Recurse -Force "$env:LOCALAPPDATA\npm-cache\_npx"
Updating. Install the new version from a terminal as above, then change the version in the client's configuration.
Tools
| tool | what it does |
|---|---|
weave_folder | Index a folder, or bring its index up to date. Only files whose size or modification time changed are read again. A run longer than 25 s returns at once and continues in the background. |
weave_search | The passages nearest a plain-language or code query, with file, line range and score. Searches the folders woven in this session, or every woven folder if none was, or one folder when asked. |
weave_list | The woven folders with their file and passage counts, and any weave still running. |
weave_forget | Delete a folder's index. The folder's files are not touched. |
Measured
On an Apple M2 Ultra (24 CPU cores, Node 24.4.1), through the MCP SDK's own stdio client, in test/smoke.mjs:
| folder | files | passages | first weave | second weave | search |
|---|---|---|---|---|---|
this package's src/ | 6 | 42 | 3.8 s, with the encoder's download | 0.013 s | 5 to 6 ms |
| the Sunstone repository | 57 | 1,367 | 20.2 s | 0.014 s | 6 ms |
Embedding runs at about 68 passages a second on that machine, so a repository of 10,000 passages takes about two and a half minutes the first time. Those figures are one run each on one machine. The smoke test's three questions about this package's own source each return the expected file first; they are a check that the pieces are wired together, not a measure of retrieval quality. For retrieval quality see the model card.
How it works
- Files. A git work tree is listed by git, so
.gitignoreholds. Any other folder is walked, skippingnode_modules, build output, virtual environments, lock files and minified files. Files over 1 MB and files that read as binary are skipped. JSON and XML are left out: in the Sunstone repository, result files underbench/results/took ranks 2 and 3 of the question above when they were included. - Passages. Code is cut at definitions into passages of about 700 characters, each labelled with the nearest definition. Prose is cut at paragraphs and sentences into passages of about 420 characters. The chunkers are Black Window's.
- Encoder.
onnx/model.onnx(fp32) through transformers.js and ONNX Runtime on the CPU, CLS pooling. - Centring. Every vector has the model's shipped mean (
centring/mean_shipped.json) subtracted and is brought back to unit length, so a score is a cosine after centring. - Search. Exact: every passage is scored. Before answering, a folder not checked in the last 30 s is brought up to date if fewer than 200 of its files changed; otherwise the answer says the index is stale.
- Index. One per folder under
/index/: a Float32 matrix and a JSONL of passages, named by a manifest that is written to a temporary file and renamed into place, so an interrupted write leaves the previous index. An index that cannot be read is moved aside rather than overwritten.
Licence
Business Source License 1.1 with an internal-use grant. You may use it for any internal purpose, including commercial development on your own or your employer's code, with no limit on seats. You may not offer it to others as a hosted search service or ship it inside a product you supply. On 15 September 2030 it becomes Apache-2.0. The encoder is downloaded under its own licence, which has the same shape. For other terms, write to burton@sunstonenorth.com.